The cross-party commission, which included the SNP, was set up by Prime Minister David Cameron in the wake of the independence referendum "No" vote, but Scottish ministers said its final recommendations fell short of delivering the powers Scotland needed.

As the councillors set fire to a document above a bin, Mr Mylet said: "The Smith Commission report - this is exactly what we think about it.

"No real powers for Scotland yet again from Westminster. We've been lied to again."

As he dropped it into the bin he added: "There you go Gordon Brown - cheers."

Mr Lawson then said: "Happy St Andrew's Day."

'Inappropriate stunts'

Speaking on the BBC's Good Morning Scotland programme, Mr Neil, who is Scotland's social justice secretary, said: "The people involved have already withdrawn this from YouTube and recognised the mistake they've made.

"It's a silly prank. I would hardly call it a hanging offence.

"I don't see how you can correlate a silly prank by a handful of individuals in Paisley with the overall strategy of the Scottish government and the SNP.

"John Swinney (Scotland's deputy first minister) and the first minister have made it absolutely clear we are very committed to taking forward the Smith process."

"What these SNP councillors fail to understand is that they are condemning a report that their own party endorsed - they are clearly still progressing through the five stages of grief after the referendum."

"This is a test for Nicola Sturgeon's leadership. Will she tolerate this or send a strong signal to her members that there must be no more inappropriate stunts like this?"